## Summary
Follow-up to #18157. Cherry-picks the useful parts from #18481 (by
@dnplkndll), adapted to align with the current state of `main`:
- **Helm unit tests** for Redis external authentication (secret-based +
plaintext password, both server and worker)
- **Helm unit tests** for `extraEnv` injection (plain values and
`valueFrom` on both server and worker)
- **JSON schema validation** for `server.extraEnv` and `worker.extraEnv`
in `values.schema.json`
- **Fix** `server_url_test.yaml` to use JSONPath filters
(`@.name=="SERVER_URL"`) instead of brittle `env[0]` index selectors
- **Fix** worker `storageEnv` whitespace (missing `-` in `{{-
$storageEnv | nindent 12 }}`)
Stale tests from #18481 (for `disableDbMigrations`, `server.env`
pass-through, and `run-migrations` init container) were dropped since
those features were removed during the #18157 cleanup.
## Test plan
- [ ] `helm lint` passes
- [ ] `helm template` renders cleanly
- [ ] Unit tests pass with `helm unittest` (requires the plugin)
Made with [Cursor](https://cursor.com)
